Countryfile takes a trip down memory lane with the legend John Craven as he celebrates 25 years on the show. To mark this quarter of a century, for one week only he'll be guest editor and decide exactly what goes into the programme. John meets fellow presenter and good friend Adam Henson on his farm to reminisce. They discuss the changes in farming over the years, the adventures he's had and the people he has met along the way, from prime ministers to pig farmers. John sets various missions for the rest of the Countryfile presenters. Back in 1989, John investigated the growth of organic farming on his first ever Countryfile appearance. A quarter of a century on, Tom Heaps looks back at that investigation and reveals brand-new research on the health benefits of organic food. Ellie explores the highs and lows of endangered species in the UK, a cause close to John's heart. And Matt does what John loves best; taking a drive in the beautiful British countryside in a classic sports car - only Matt does it in an Aston Martin!